My colouring is kind of minimal because I'm not that great at shading so I don't get really hardcore about it, but I do like....base layer -> New layer set to multiply for one colour -> another new layer set to multiply for the matching shading colour (you can do the same one over it, which gives some shadows, although for this I just grabbed different shade colours off a colour manga page). I do shading where it's actually shaded on the B&W image, then like, along the hairline and just under strands of hair on the face, along the edge of the nose, sometimes right above the eyes and under the mouth. If you want, I can upload one of the fullsized PSDs if you want to flip through the layers and shit to get a better sense of it, I'm bad at explanations.

And yes, he totally is :D

I just tested in in the lastest version of GIMP I have, and yep, it works! File is here (http://www.tokyo-tower.org/photos/icons/final/BLEACH14%20page%20104.psd)

That's his snarky troll face XD